From: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
To: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>,
"libc-alpha@sourceware.org" <libc-alpha@sourceware.org>,
"H . J . Lu" <hjl.tools@gmail.com>
Cc: kirill <kirill.okhotnikov@gmail.com>
Subject: Re: [PATCH v2 4/5] math: Improve fmodf
Date: Thu, 16 Mar 2023 19:15:06 +0000 [thread overview]
Message-ID: <PAWPR08MB8982617EE7B1855D94ABF99C83BC9@PAWPR08MB8982.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <3d3ff2cd-2187-8b54-cb4d-bbf6d9c7ed88@linaro.org>
Hi Adhemerval,
>> So we do need to handle zero case here, I think fmodf (5, 1) will now
>> return 0.5... We could add support in make_float (see below).
>
> Ok, although at least for fmodf (5, 1) current algorithm does return 0.
Try printing with %a, on AArch64 it shows 0x1p-25 (ie. 0.5 * 1p-24 from
passing ey-1 to make_float and CLZ (0) - 8 == 32 - 8).
Again odd no testcase caught it...
Cheers,
Wilco
next prev parent reply other threads:[~2023-03-16 19:15 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-15 20:59 [PATCH v2 0/5] Improve fmod and fmodf Adhemerval Zanella
2023-03-15 20:59 ` [PATCH v2 1/5] benchtests: Add fmod benchmark Adhemerval Zanella
2023-03-15 20:59 ` [PATCH v2 2/5] benchtests: Add fmodf benchmark Adhemerval Zanella
2023-03-15 20:59 ` [PATCH v2 3/5] math: Improve fmod Adhemerval Zanella
2023-03-16 0:58 ` H.J. Lu
2023-03-16 14:28 ` Adhemerval Zanella Netto
2023-03-16 16:13 ` Wilco Dijkstra
2023-03-16 20:39 ` Adhemerval Zanella Netto
2023-03-17 14:55 ` Wilco Dijkstra
2023-03-17 16:07 ` H.J. Lu
2023-03-17 18:22 ` Wilco Dijkstra
2023-03-15 20:59 ` [PATCH v2 4/5] math: Improve fmodf Adhemerval Zanella
2023-03-16 18:11 ` Wilco Dijkstra
2023-03-16 18:38 ` Adhemerval Zanella Netto
2023-03-16 19:15 ` Wilco Dijkstra [this message]
2023-03-16 19:45 ` Adhemerval Zanella Netto
2023-03-15 20:59 ` [PATCH v2 5/5] math: Remove the error handling wrapper from fmod and fmodf Adhemerval Zanella
2023-03-16 17:21 ` Wilco Dijkstra
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